Materials Literature
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The dielectric functions of the MAX phases, Ti3SiC2 and Ti4AlN3, have been determined from first principles calculations. We compared the dielectric functions and the reflectivity spectra of Ti3SiC2 and Ti4AlN3 with those of TiC and TiN. The optical spectra were analyzed by means of the electronic structure, which pro…
The electromechanical behavior of (1−x)Bi0.5Na0.5TiO3–xK0.5Na0.5NbO3 (BNT-KNN) lead free piezoelectric ceramics is investigated for 0⩽x⩽0.12 to gain insight into the antiferroelectric-ferroelectric (AFE-FE) phase transition on the basis of the giant strain recently observed in BNT-based systems. At x≈0.07, a morphotro…
A super-gelator for cyclohexane is presented, one of four cholesterol-appended ferrocene derivatives specifically designed and prepared as new low-molecular-weight organogelators. The gel forming from this system can be molded into films, forms at room temperature, and is responsive to various stimuli (see figure), in…
This book covers state-of-the-art techniques commonly used in modern materials characterization. Two important aspects of characterization, materials structures and chemical analysis, are included. Widely used techniques, such as metallography (light microscopy), X-ray diffraction, transmission and scanning electron m…
The $1+1$ layer folded graphene sheets that deviate from $AB$ stacking are successfully fabricated and their electronic structures are investigated by Raman spectroscopy. Significant blueshift of the 2D band of folded graphene compared to that of single layer graphene (SLG) is observed. This is attributed to SLG-like…
Porous metal oxide hollow architectures are achieved. High-porosity hollow doughnut-shaped and spherical CuO structures are synthesized by thermal oxidation of the corresponding CuS and Cu2S precursors, respectively. A combination of non-equilibrium interdiffusion, volume loss, and gas release are proposed to explain…
White LEDs are fabricated through a combination of blue LEDs with Sr3 SiO5 :Ce(3+) ,Li(+) phosphors and organically capped CdSe quantum dots (QDs), which exhibit a 2D superlattice. The combination of blue emission from the LEDs, greenish-yellow emission from the phosphors, and red emission from the QDs generates white…
Shear brilliance: The photoluminescent color of a pyrene-based liquid crystal changes from yellow to blue-green upon mechanical shearing due to a phase transition from a micellar cubic to a columnar phase (see picture).
We compute the electronic structure, momentum resolved spectral function and optical conductivity of the new superconductor LaO1-xFxFeAs within the combination of the density functional theory and dynamical mean field theory. We find that the compound in the normal state is a strongly correlated metal and the parent c…
Bismuth ferrite, BiFeO3, is the only known room-temperature magnetic ferroelectric material. We demonstrate here, using neutron scattering measurements in high quality single crystals, that the antiferromagnetic and ferroelectric order parameters are intimately coupled. Initially in a single ferroelectric state, our c…
Tubes of a furnace where ethylene dichloride (EDC) was cracked into vinyl chloride monomer (VCM) in a petrochemical industry, lost their structural integrity and developed cracks after about five years of operation. Various sections of a failed furnace tube were metallurgically evaluated using scanning electron micros…
Modeling the deformation of shapes under constraints on both perimeter and area is a challenging task due to the highly nontrivial interaction between the need for flexible local rules for manipulating the boundary and the global constraints. We propose several methods to address this problem and generate ldquorandom…
The energy spectra of electrons elastically scattered by plane-parallel solid layers are presented. The solid surface is analyzed by a method based on the identification of similar spectra and is called electron Rutherford scattering in analogy with the well-known ion spectroscopy method. The effect of multiple scatte…
The lattice vibration spectra, rf permittivity, and dynamic Born charges of disordered PbB′1/2B″1/2O3 (B′ = Ga, In, Lu; B″ = Nb, Ta) solid solutions are calculated in terms of the generalized Gordon-Kim model. All the compounds are found to have soft modes related to the center (Γ15) and boundary point R (R 15) of the…
This study examines the effect of atmospheric pressure plasma treatment on the surface energy and adhesive bond strength of three medical polymers: acetal copolymer (AC), polycarbonate (PC) and polyethylene terephthalate (PET). Surface treatments were applied with a two-inch plasma beam source and reactive oxygen-heli…
This paper presents both investigations of high-energy luminescence with maximum at 7.5 eV in BaF2:Y3+and BaF2:Yb3+crystals and theoretical calculations of cross-luminescence spectrum in crystals of barium fluoride with interstitial ions of fluorine. The dependencies of the 7.5 eV emission intensity as function of dif…
The calibration of apparent charge, which can be traced to AC voltage and capacitance, for partial discharge(PD) calibrator is discussed. The methods of fast sampling measurement of peak-to-peak amplitude for step voltage by digital multimeter and the arithmetic in the automatic measurement of apparent charge by digit…
Using modern methods of analysis, investigations of the phase composition, structure, and properties of powders of aluminum oxide synthesized by the plasmochemical method are carried out. The possibility of plasmochemical technology of treatment of dispersed raw materials for obtaining submicrometer and nanodimensiona…
The comparison between calculated and measured dose rates of the cask for 12 spent fuels has been performed and this result confirms the shielding integrity of KN-12 transport cask to transport the spent fuel with safe. In February 2007, the dose rate measurements of KN-12 cask were performed in the spent fuel deconta…
Abstract:- For enhancement the insulation quality of medium voltage and high voltage power cables, on-site partial discharge (PD) diagnosis tests such as detection, location and identification are used to find defects or faults and assess ageing degree of the cable insulation. Typical test methods such as oscilating v…